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Improved pileup reweighting

Andrey Popov requested to merge pileup into master

Rework class PileUpWeight implementing the following changes:

  • The expected number of pileup interactions is now read from the event under the hood as opposed to being provided as a parameter.
  • Pileup profiles needed to compute the weights are read from ROOT files with configurable paths.
  • Systematic variation in pileup has been implemented.

The input ROOT files with pileup profiles are placed in the directory with catalogues. They are documented in

/pnfs/iihe/cms/store/group/HZZ2l2nu/Bonzais/Catalogs/September2018_newIDIso_v2/pileup.md

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